Eagleflying can supply the turnkey self-drilling screw production line.

Self-drilling screws (Tek screws) are among the most efficient fasteners in metal construction, roofing, cladding, steel framing, HVAC and solar mounting — they drill, tap and fasten in one operation with no pilot hole required. A turnkey self-drilling screw line takes you from steel or stainless wire rod to inspected, coated and packed finished screws. It is a cold-forming + drill-point-forming + thread-rolling + heat-treatment + surface-treatment system, broader than a standard self-tapping line because it adds precision drill-point geometry (Tek #1 to #5) and often includes washer assembly for roofing applications.

1. Typical Products

Hex washer head self-drilling screws (DIN 7504 / ISO 15480)

Pan head, countersunk head, truss head, wafer head Tek screws

ST2.9, ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, ST6.3

Length range: 9.5–150 mm (or 1/2"–6")

Drill-point classes: Tek #1 to #5 for sheet thickness 0.7–8 mm+

Variants: winged point (for wood-to-steel), bi-metal, stainless 410/304/316, EPDM/steel/nylon washer assembled

Coatings: zinc plating, yellow/black passivation, phosphate, Dacromet, Ruspert, hot-dip galvanizing

Standards: DIN 7504, ISO 15480, ISO 15481, ISO 15482, ANSI/ASME B18.6.4

2. Production Flow

Wire Rod→Descaling/Pre-treatment→Wire Drawing→Cold Heading→Drill-Point Forming→Thread Rolling→De-oiling→Heat Treatment→Surface Treatment→Washer Assembly→Inspection →Packing

Stage	Equipment	Purpose
Wire preparation	Descaler, lubricant coater	Clean oxide scale, apply lime/soap coating for drawing
Wire drawing	Straight-type / pulley drawing machine	Reduce rod to tapping-screw shank diameter (2.9–6.3mm)
Cold heading	1-die 2-blow/2-die 2-blow/3-station header	Form hex/pan/CSK/truss head, recess, blank length
Drill-point forming	Pointing die/flute station/CNC flute grinder	Form fluted drill point (Tek #1–#5) for self-drilling
Thread rolling	High-speed flat-die/cylindrical-die roller	Roll self-drilling threads on soft blank
De-oiling	Wash tank/ultrasonic de-oiler	Remove rolling oil before furnace
Heat treatment	Mesh-belt carburizing + quench + temper furnace	Case-hardened point and threads, tough core
Surface treatment	Zinc plating/Dacromet/Ruspert/phosphate line	Corrosion resistance by market
Washer assembly	Washer pressing machine	Press EPDM/steel washer onto screw shank
Inspection	Optical sorter, hardness tester, drill test	Dimensional, metallurgical and functional QC
Packing	Counting+bagging/box/collated-strip machine	Bulk, boxed, or magazine-packed finished screws

Threads are rolled before heat treatment; this is the standard self-drilling screw method and gives stronger, cleaner threads than cutting. Drill-point flutes are formed in-header for smaller sizes (#1–#3) or CNC-ground after heading for larger Tek points (#4–#5).

3. Key machine specification (reference)

Wire diameter: 2.9–6.3 mm (ST2.9–ST6.3)

Screw length: 9.5–150 mm

Cold heading: ST2.9 180–220, ST3.5 160–180, ST4.2 120–160, ST4.8 100–140, ST5.5 80–120, ST6.3 45–90 pcs/min.

Drill-point forming: ST2.9 200–550, ST4.2 150–480, ST4.8 120–400, ST6.3 80–250 pcs/min.

Thread rolling: ST2.9 300–380, ST3.5 280–350, ST4.2 220–280, ST4.8 170–240, ST5.5 110–180, ST6.3 80–130 pcs/min.

Header motor: 0.75–7.5 kW

Thread roller motor: 1.1–7.5 kW

Drill-point machine motor: 0.55–3.0 kW

Mesh-belt furnace: 60–300 kg/h by model (typical line 150–250 kg/h)

Zinc/Dacromet line: 150–600 kg/h by configuration

Realistic line efficiency: 80–90% under stable conditions

Catalog speeds are not sustained speeds. Tooling wear, wire quality, length changes, and packing bottlenecks all affect real output.

4. Machine configuration

No.	Equipment	Function
1	Pay-off + straightener	Control wire tension and straightness
2	Wire drawing machine	Reduce rod to 2.9/3.5/3.9/4.2/4.8/5.5/6.3mm
3	Cold heading machine (1D2B/2D2B/3-station)	Head, recess, blank length, drill-point pre-form
4	Drill-point forming machine	Fluted drill point (Tek #1–#5), CNC flute grinding
5	Thread rolling machine	Flat-die thread forming for self-drilling screws
6	De-oiling machine	Remove rolling oil before furnace
7	Mesh-belt heat treatment furnace	Carburizing + quench + temper for case-hardened points
8	Plating/Dacromet/Ruspert/phosphate line	Corrosion protection by market
9	Washer assembly machine	EPDM/steel washer feeding and pressing
10	Optical sorter + drill/torque test	Dimension, crack, point geometry, coating, washer check
11	Packing machine	Bulk, boxed, collated strips, magazine coils

5. Capacity Reference

Size	Header Speed	Roller Speed	Balanced Output	Annual (300d×20h)
ST2.9×13-25 mm	180-220pcs/min.	300-380pcs/min.	~180pcs/min.	~64.8 Million pcs/yr ≈ 2–4t/yr
ST3.5×16-32 mm	160-180pcs/min.	280-350pcs/min.	~160pcs/min.	~57.6 Million pcs/yr ≈ 6–10t/yr
ST4.2×19-50mm	120-160pcs/min.	220-280pcs/min.	~120pcs/min.	~43.2 Million pcs/yr ≈ 12–20t/yr
ST4.8×25-75mm	100-140pcs/min.	170-240pcs/min.	~100pcs/min.	~36.0 Million pcs/yr ≈ 22–35t/yr
ST5.5×32-100mm	80-120pcs/min.	110-180pcs/min.	~80pcs/min.	~28.8 Million pcs/yr ≈ 38–55t/yr
ST6.3×50-150mm	45-90pcs/min.	80–130pcs/min.	~45pcs/min.	~16.2 Million pcs/yr ≈ 70–100t/yr

Note: Output drops significantly at max size due to longer feed and roll cycle time. This is inherent to self-drilling screw geometry.

6. Material & Finishing

Wire: C1018 / C1022A / 10B21 low-carbon cold heading wire; 410/304/316 stainless; bi-metal (steel shank + stainless point)

Case hardness: approx. HV450–560

Core hardness: approx. HRC 25–35

Zinc plating: general corrosion resistance for outdoor use

Black phosphate: indoor, dry environments

Dacromet / Ruspert / ceramic coating: humid, coastal or semi-corrosive environments

Hot-dip galvanizing: heavy corrosion protection

Washer: EPDM rubber, bonded steel/EPDM, nylon, color-matched

7. Line Configurations We Offer

Basic line:

1 header + 1 drill-point former + 1 thread roller + simple furnace + manual packing

Good for trial production or small self-drilling screw plant.

Standard Line:

Wire drawing + 1D2B/2D2B header + drill-point former + high-speed thread roller + mesh-belt heat treatment + zinc/Dacromet line + washer assembly + automatic packing

Best choice for standard self-drilling screw plant.

High-Speed Line:

Dual headers + dual rollers + CNC point grinding + online inspection + robotic/collated packing

For large-scale industrial base serving roofing and cladding markets.

8. Our Scope as Turnkey Integrator

We design and supply the complete line:

Line configuration by product mix and target capacity

Machine sourcing from verified Chinese fastener-equipment makers

Factory layout and material flow drawing

Tooling and die list (header dies, thread rolls, drill-point tools, cutting dies)

Heat-treatment recipe and coating process parameters

English operation manuals and spare-parts list

Installation supervision/remote commissioning

After-sales coordination with equipment suppliers

9. Why Buyers Choose a China-Made Turnkey Line

Lower CAPEX than European/Japanese lines

Mature supply chain for headers, rollers, furnaces, plating lines, drill-point formers

Fast delivery for emerging-market greenfield plants

Spare parts and consumables are economical

Washer assembly and optical sorting ready for export-grade roofing screws

10. Equipment Data

Mesh-belt heat treatment furnace: carburizing + quench + temper, 60–300 kg/h (typical 150–250 kg/h)

Zinc plating line: 150–300 kg/h standard

Dacromet line: 200–600 kg/h

Black phosphate line: 200–400 kg/h

Cold heading machine: wire 2.9–6.3 mm, max blank 150 mm, 45–220 pcs/min by size

Thread rolling machine: flat-die, 2.9–6.3 mm, max 150 mm, 80–380 pcs/min by size

Drill-point forming machine: 0.55–3.0 kW, 80–550 pcs/min by size and point class

Optical sorter: 120–600 pcs/min, checks head, length, thread, drill point, coating, washer

FAQ:

Q: Can one line make all head types (hex washer, pan, countersunk, truss)?

Yes, by changing header tooling (punches and dies). Head changeover typically takes 2–4 hours including setup and first-piece inspection.

Q: Do you supply the steel wire?

We can recommend verified Chinese wire mills (C1022A, 10B21, C1018). Many clients buy wire locally to save freight; we provide full material specifications so your local supplier can match.

Q: What drill-point class should I choose for my market?

Tek #1 for 0.7–1.9 mm sheet, Tek #2 for 1.5–3.5 mm, Tek #3 for 2.5–5.0 mm, Tek #4 for 3.0–6.0 mm, Tek #5 for 5.0–8.0 mm. We help you select based on your target application and local building practices.

Q: What coating should I choose?

Zinc plating for general outdoor use. Dacromet or Ruspert for coastal, humid or corrosive environments. Hot-dip galvanizing for heavy corrosion. We configure the surface-treatment section accordingly.

Q: Can the line handle both carbon steel and stainless steel?

Carbon steel (C1022A / 10B21) is standard. Stainless (410/304/316) requires different tooling material and 20–30% slower speeds due to work hardening. Bi-metal screws require a two-wire assembly station. Let us know if stainless or bi-metal is in your product plan.

Q: How long does tooling last?

Header punches: 500,000–1,000,000 pieces depending on wire quality and size. Thread rolling plates: 2,000,000–5,000,000 pieces. Drill-point tools: 300,000–800,000 pieces depending on point class. We supply spare tooling lists and can provide drawings for local resharpening or reorder.

Q: What is the changeover time between sizes?

Wire diameter change: 30–60 minutes. Length change on header: 15–30 minutes. Thread roll change: 20–40 minutes. Drill-point tool change: 20–30 minutes. Full changeover from ST4.2 to ST6.3 including all tooling: half a day to one day.

Q: Do you provide operation manuals and training?

Yes. English operation manuals, tooling changeover guides, heat-treatment recipes, and coating parameters are included. On-site installation, commissioning, and operator training are part of the turnkey scope. HMI in English, Spanish, Arabic, or French.

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